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Mohorovicic discontinuity
A layer of the Earth originally regarded as marking the boundary between crust and mantle, evidenced by a change in the velocity of seismic waves. It is now regarded as of little physical significance. The US project Mohole, designed to drill through the "Moho," was abandoned in 1966. More important are the discontinuities between the core and the mantle (Gutenberg or Oldham discontinuity), with a radius of about 3,500 km; and between the inner and outer cores, with a radius of 1,200 km and 1,650 km.
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